A c with a circle around it is the 'copyright' symbol.
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Symbol for "registered trademark"
The little TM symbol in a circle represents a trademark. It indicates that the word, phrase, logo, or symbol that it is associated with has been registered as a trademark to protect it from unauthorized use. It signifies ownership and asserts the rights of the trademark owner.
The distance around a circle is the Circumference (C). C= pi*d If 12' is the diameter (d), then C= 12*pi= 12*3.14= 37.68 ft (approximately).
A little R in a circle usually means "registered trademark".
Circumference refers to the size of something as given by the distance around it, e.g. the circumference of a circle is the distance around it, or its perimeter. The circumference of a circle can be used in the following formula to determine other values in a circle: C=2πr, or C=πd, where C is the circumference of the circle, r is the radius of the circle, d is the diameter of the circle and equivalent to twice the radius, and pi is, well, pi.